题目内容

脱式计算
1
3
×
2
5
×
3
10

12×(
1
4
+
1
3
-
1
6

5
7
÷[1÷(
2
3
-
1
5
)].
(1)5×
1
3
×
2
5
×
3
10

=(5×
2
5
)×(
1
3
×
3
10

=2×
1
10

=
1
5


(2)12×(
1
4
+
1
3
-
1
6

=12×
1
4
+12×
1
3
-12×
1
6

=3+4-2
=5;

(3)
5
7
÷[1÷(
2
3
-
1
5
)]
=
5
7
÷[1÷
7
15
]
=
5
7
÷
15
7

=
5
7
×
7
15

=
1
3
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